Physconia subaquila (Nyl.) Cl. Roux

(provisionally placed here, ICN Art. 36.1b). Basionym: Physcia subaquila Nyl. - Syn. Meth. Lich., 1, 2: 421, 1860
Synonyms: Hagenia venusta var. subaquila (Nyl.) Bagl.; Heterodermia subaquila (Nyl.) Trevis.; Parmelia subaquila (Nyl.) Jatta; Physcia aquila var. subaquila (Nyl.) H. Olivier; Physcia venusta f. subaquila (Nyl.) H. Olivier; Physconia venusta subsp. subaquila (Nyl.) Clauzade & Cl. Roux; Pseudophyscia aquila var. subaquila (Nyl.) Boistel
Distribution: C - Sar (Baglietto 1879).
Description: Thallus foliose, heteromerous, dorsiventral, closely to loosely attached, forming rather regular rosettes, the lobes 1-2(-3) mm broad, elongate, flattened. Upper surface grey-green when dry, but often turning brown in specimens of sun-exposed sites, intensively green when wet, coarsely white-pruinose at least at lobe-tips. Lower surface black, with black, simple rhizines. Upper and lower cortex prosoplectenchymatous; medulla white. Apothecia very rare, lecanorine, with a dark but often white-pruinose disc and an often lobulate thalline margin. Epithecium brown; hymenium and hypothecium colourless; paraphyses slender, simple or forked in upper part, the apical cells clavate, with a thin, dark brown cap. Asci 8-spored, clavate, the K/I+ blue tholus penetrated by a faintly amyloid apical cushion with parallel or diverging flanks, the wall K/I-, surrounded by a K/I+ blue outer layer, Lecanora-type. Ascospores 1-septate, brown, ellipsoid, 25-40 x 15-20 µm, thickened at septum but not at apices, Physconia-type. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on siliceous rocks, mostly in the Mediterranean-montane belt. This poorly known species was often confused with Ph. venusta, but is saxicolous and differs from the saxicolous Ph. petraea
Growth form: Foliose, narrow lobed
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: very rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: extremely rare
Dry mediterranean belt: absent

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 24/10/2016 - bord de mer, Conca, alt. 5 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 24/10/2016 - bord de mer, Conca, alt. 5 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 24/10/2016 - bord de mer, Conca, alt. 5 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, Ile Cavallo, alt. 29 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, Ile Cavallo, alt. 29 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, Ile Cavallo, alt. 29 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 11/10/2018 - Ajaccio, Pointe de la Parata, alt.5 m - Corse


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 24/10/2016 - bord de mer, Conca, alt. 5 m - Corse


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_P/Text_P_4/Physconia_subaquila.htm
France, 11/10/2018 - Ajaccio, Pointe de la Parata, alt.5 m - Corse


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara


Bernard Bouffinier - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=1443&lang=en
France, Corse, Plage de Corbara